package top.ikunikun.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import top.ikunikun.common.CustomException;
import top.ikunikun.domain.Setmeal;
import top.ikunikun.domain.SetmealDish;
import top.ikunikun.dto.SetmealDto;
import top.ikunikun.mapper.SetmealMapper;
import top.ikunikun.service.SetmealDishService;
import top.ikunikun.service.SetmealService;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {
    @Autowired
    private SetmealDishService setmealDishService;
    @Override
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        // 保存套餐基本信息，操作setmeal,执行insert操作
        this.save(setmealDto);
        // 保存套餐和菜品的关联信息，操作setmeal_dish，执行insert操作
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes = setmealDishes.stream().peek(item -> item.setSetmealId(setmealDto.getId())).collect(Collectors.toList());
        setmealDishService.saveBatch(setmealDishes);
    }

    /**
     * 删除套餐，同时需要删除套餐和菜品关联的数据
     * @param ids
     */
    @Override
    @Transactional
    public void removeWithDish(List<Long> ids) {
        // 查询套餐状态，确定是否可以删除
        LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(Setmeal::getId,ids);
        queryWrapper.eq(Setmeal::getStatus,1);
        int count = this.count(queryWrapper);
        if (count > 0){
            // 如果不能删除，抛出一个业务异常
            throw new CustomException("套餐正在售卖中，无法删除");
        }
        // 如果可以删除，先删除套餐表中的数据
        this.removeByIds(ids);
        // 删除表关系中的数据
        LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.in(SetmealDish::getSetmealId,ids);
        setmealDishService.remove(lambdaQueryWrapper);
    }
}
